How to use application insights in .net standard library?

Question

I have used application insights in web api. It works well. Currently, our controller need call a class library (referred by nuget package). I need to use application insight in class library. There is no exception but nothing logged in Application insights. I write the code as following. Our TelemetryConfiguration have initialized in controller already.

var telemetryClient = new TelemetryClient();
var customEvent = new Microsoft.ApplicationInsights.DataContracts.EventTelemetry
{
    Name = "helloworld",
};
// customEvent.Metrics.Add({ "latency", 42});
telemetryClient.TrackEvent(customEvent);

What should I do to make the application insights work?

"it doesn't work in the library" doesn't explain what's actually happening. Does it throw an exception? Does nothing get logged to AppInsights? Please edit that information into your question. — Ian Kemp - SO dead by AI greed
– Ian Kemp - SO dead by AI greed, Commented Nov 1, 2019 at 11:02

Mauricio Atanache · Accepted Answer · 2019-11-01 12:11:10Z

2

Normally the following steps are enough to log to App Insights:

1- In your WebApi startup class and your library project add App Insights assembly thru nuget.

Microsoft.ApplicationInsights

2- Register App Insights in your startup class:

services.AddApplicationInsightsTelemetry(Configuration);

3- Setup your instrumentation key in appsettings.json:

"ApplicationInsights": {
  "InstrumentationKey": "<Your instrumentation key here>"
}

4- In any class you need, inject a TelemetryClient and use it.

using Microsoft.ApplicationInsights

namespace MyNamesPace
{
    public class MyClass
    {
        private readonly TelemetryClient _telemetryClient;

        public MyClass(TelemetryClient telemetryClient)
        {
            _telemetryClient= telemetryClient;
        }

        public myClassMethod()
        {
            // Use your _telemetryClient instance
            _telemetryClient.TrackEvent("Your Telemetry Event");
        }
    }
}

4- In your controller inject your class

namespace MyApiNamesPace
{
    public class MyController : ControllerBase
    {
        private readonly IMyClass _myClass;

        public MyClass(IMyClass myClass)
        {
            _myClass = myClass;
        }

        public IActionResult myAction()
        {
            _myClass.MyClassMethod();
        }
    }
}

5- Don't forget to register your class in your DI container, in startup class:

services.AddScoped<IMyClass, MyClass>();

Happy programming!!

edited Nov 1, 2019 at 12:11

answered Nov 1, 2019 at 11:20

Mauricio Atanache

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13 Comments

highbury zhu Over a year ago

Thanks for your answer. step 1, step 2 have already done. I think my code in class above is almost same as you write in step 3. But nothing get logged to AppInsights. Since my class is another repo, I referred by nuget package. I don't know whether if affect the behavior.

Mauricio Atanache Over a year ago

Have you setup your key in appsettings.json ?

highbury zhu Over a year ago

In controller, I have set it. But in the repo of my class library, I do not set it.

Mauricio Atanache Over a year ago

I've edited my post to explain how to set it up, second point will use this entry in your settings file.

Mauricio Atanache Over a year ago

Note that you need to inject the Telemetry in the using class to use the instance and configuration registered in your api project. If you instantiate a new telemetry in your class instead of injecting it, settings are going to get lost.

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